TY - JOUR

T1 - Online Grid Measurement and ENS Detection for PV Inverter Running on Highly Inductive Grid

A1 - Timbus,Adrian Vasile

A1 - Teodorescu,Remus

A1 - Blaabjerg,Frede

A1 - Borup,Uffe

AU - Timbus,Adrian Vasile

AU - Teodorescu,Remus

AU - Blaabjerg,Frede

AU - Borup,Uffe

PB - I E E E

PY - 2004

Y1 - 2004

N2 - Photovoltaic (PV) and other sources of renewable energy are being used increasingly in grid-connected systems, for which stronger power quality requirements are being issued. Continuous grid monitoring should be considered so as to provide safe connections and disconnections from the grid. This letter gives an overview of the methods used for online grid measurement with PV inverters. Emphasis is placed on a method based on the injection of a noncharacteristic harmonic in the grid. Since this injection is regarded as a disturbance for the grid, different issues, i.e., the influence on total harmonic distortion (THD), the accuracy of line impedance measurement and the ENS (German abbreviation of Main Monitoring units with allocated Switching Devices) detection are studied. Laboratory results conducted on an existing PV inverter are presented to demonstrate the behavior of the PV inverter under different grid conditions. Some of the injection parameters are tuned in order to get an accurate measurement of line impedance.

AB - Photovoltaic (PV) and other sources of renewable energy are being used increasingly in grid-connected systems, for which stronger power quality requirements are being issued. Continuous grid monitoring should be considered so as to provide safe connections and disconnections from the grid. This letter gives an overview of the methods used for online grid measurement with PV inverters. Emphasis is placed on a method based on the injection of a noncharacteristic harmonic in the grid. Since this injection is regarded as a disturbance for the grid, different issues, i.e., the influence on total harmonic distortion (THD), the accuracy of line impedance measurement and the ENS (German abbreviation of Main Monitoring units with allocated Switching Devices) detection are studied. Laboratory results conducted on an existing PV inverter are presented to demonstrate the behavior of the PV inverter under different grid conditions. Some of the injection parameters are tuned in order to get an accurate measurement of line impedance.

JO - IEEE Power Electronics Letters

JF - IEEE Power Electronics Letters

SN - 1540-7985

IS - 3

VL - 2

SP - 77

EP - 82

ER -